The Beatles are easily my greatest influence musically and George is such a big part of that. Watching his growth as a songwriter in the Beatles and after is such a fantastic thing. You can literally hear the confidence in his songs growing. If you've not read Here There and Everywhere by Geoff Emerick, I HIGHLY suggest it. I may have already mentioned this to you or flagamuffin in the past as I tend to do so anytime the Beatles are mentioned. It's that good. According to Emerick, George was a really insecure guitarist but really came in to his own towards the end of the Beatles, watching this performance it's evident that he's pretty damned secure in his abilities by this point. Knowing how much effort and money he put in to the Concert for Bangladesh, it's impressive that he's able to perform so effortlessly. The guy had a lot riding on this concert. He was a rare breed, a truly gifted person. Like you, I wish I could have heard the music he didn't have a chance to make.
I will definitely have to read that. Going to check if my college's library has it, doubtful, but it's worth a shot.
Good luck, hope they have it. It's worth searching for.